I got this lens off of eBay as part of a Cine 16mm camera. Note to fellow photogs: these make really good macro lenses at 10:1 and above when reverse-mounted, apparently on par with the best macro lenses in that range you can buy. You'll need bellows for them.

They can also be used front forward on Olympus micro-Four Thirds cameras, but they don't quite cover the m4/3 sensor.

These lenses sold separate from the vintage Kodak Cine cameras tend to go for a lot more (sellers are starting listing prices at $250 right now). I suspect the difference is because many with the lens in an old 16mm video-camera don't know they have anything other than junk. The rear element is protected inside the camera and the front element is recessed, so other than maybe some dust, I suspect most of these lenses should be ok.

If you decide to buy one, it can only be removed from the camera by unscrewing the faceplate on the front of the camera, then unscrewing 2 retaining screws that hold the it in place.